Esterlike derivatives of azo dyestuffs



l atented Jan. 24, 195 0 I UNITED STATES PATENT OFFICE 'ESTERLIKE DERIVATIVES 0F Azo- DYESTUFES- Friedrich Felix and Alphonse HeckendormBasel; Ernst Reich, Neue Welt, and Fritz Oest'erlein; Basel, Switzerland, assignors-to Ciba Limited, Basel, Switzerland, a Swiss firm Serial No. 617,698.

2 Claims. (01. zen-5202) U. S. Patents Nos. 2,170,262, 2,120,741, 2,199,048 and 2,276,187 describe the preparation of esterlike dyestufi derivatives by treating dyestuffs containing hydroxyl groups with organic acylating:

agents which contain, in addition to the acylating group, at least one substituent which, if necessary after suitable conversion, imparts solubility to the acyla-tion" products. These esterification products have hitherto been used principally for dyeing cellulosic materials (cf. U. S. Patent No. 2,095,600).

Application Serial No. 617,697, filed on even date herewith, demonstrates that esters obtained according to the processof U. S. Patents Nos. 2,170,262, 2,120,741, 2,199,048 and 2,276,187, can surprisingly be used with good results for chroming animal fibers if the dyeing, is conducted in the presence of ammonium sulfate and an alkali chromate.

The object ofv the present invention. is to produce new esters. which. are especially suitable for dyeing animal fibers by the process of. applica; tion. Serial No. 617,697. These esters are derived principally from. ortho:ortho'-dihydroxyazo dyestuffs obtained from aromatic ortho hydroxylated diazo compounds and aromatic or heterocyclic hydroxyl compounds which couple in ortho-position with respect to the hydroxyl. group, the two components being so selected that the-resulting ortho:ortho'-dihydroxyazo-dyestufi, if it contains n0 nitro groups, will contain at least two substituents which do not impart solubility. In the latter caseuthe resultant dyestuffs are subsequently nitrated. Thus, the dyestuffs are produced by an appropriate combination of diazo compounds, which are made, for. example from the ortho-aminophenols or ortho-aminonaphthols or analogues thereof hereinafter mentioned, with coupling components of the type of the hydroxy compounds also mentioned hereinafter.

There may be used as ortho-aminophenols, among others: 1-hydroxy-2-amino-benzene, 1-

hydroxy- 2 amino 4 chlorobenzene, 1 hydroxy 2 amino- 4 nitrobenzene', 1 hydroxy-2- amino-5-nitrobenzene, 1, hydroxy-2-amino-4zfidinitrobenzene, 1 hyd-roxy 2 -,am'ino 4:6 dichlorobenzene, 1 hydroxy 2 amino-3:4:6-trichlorobenzene, l hydroxy-2-amino-3:41526-tetrachlorobenzene, l-hydroxy-2amino-4-chloro-5- nitrobenzene, 1 hydroxy 2- amino-4-chloro-6- 7 2. nitrobenzene, ],--hydroxy 2 amino- 4- nitro-G- chlorobenzene', 1-hydroxy-2-amino- 4 benzotrn fluoride, l,-hydroxy'-2-ami-no.-4-methuxybenzene,

1.-l 1yd-rox y 2 aminon-aphthalene, 2-hydroxy-laminonaphthalene, 1 hydroxy 8 aminonaphthalene, 4 -ch-1or0-4 a-min0 2 -methyl 5 hydroxy-l- 1. -azobenzene,. etc. Ascoupling components there may be used, among others, the following hydroxy-lcompounds:

l-hydroxynaphthalene, Zt-hydroxynaphthalene, 1-hyd roxy-4-chloronaphthalene, l-hydroxy-fi-zfidichloronaphthalene, 11-hyd-roxy-5 chloronaphthalcne, 2-hydroxy 6:-'methoxynaphthalene, 2- hydroxy-7unethoxynaphthalene, 2-hydroxy-4-z6- dichloronaphthalena, 2-hydroxy 4:6 dibromonaphthalene, lj-hydroxy-4-methoxynaphthalene, l-hydroxynaphthalene 4 methylketone, 1 hydroxyna-phthalene-4phenylketone,. 1-hydroxy-4- ethylnaphthalene, 1 hydroxy 5 nitronaph thalene, 2 hydroxy -,5 nitronaphthalene, 2-hydroxy-S-nitronaphthalene; also arylides of 2:3- hydroxynaphthoic acid, such as the condensation products. of this acid with amino compounds, such as l-ami-nobenzene, l-am-ino 2 methoxybenzene, 4-a1nino-1:Y-azobenzene, etc; also compounds of the benzene series, such as I-hydroxy-t-methylbenzene, 1 4 hydroxy- 2 allyl-4- m'ethylbenzene; l -hyd roxy-2-n-propyl-4-methylbenzene, l hydroxy-Z-isopropyl 4 methyl-benzen'e; 1"-hydroXy-2-benzy1'- 4 -methylbenzene, 1 hydroxy-2-methyl-4-ethylbenzene, 1 -hydroxy-2 ethyl-4-methylbenzene; r --hydroxy-2-methyl-4- i'sopropylbenzene, 1 h-yd-roXy-2-methyl-4-cyclohexylbenzene, 1-hydroxy-2-methy1-4-benzylbenzene, 1'-hydroXy- 2--benzyl-4-n-propylbenzene; etc.

Hydroxyl compounds are alsoto' be understood to mean compounds containing enolizable keto groups, such as, for instance, 3-m'ethyl-5-pyrazolone, 1-phenyl-3-methyl-5-pyrazolone, 1-(2' :5- dichloro) -phenyl-3-methyl-5-pyrazolone, 1 (3'- chloro) -phenyl-3-methyl 5-pyrazolone, 1- (3-nitro) -pheny1-3-methyl 5 pyrazolone, 2:4 dihydroxyquinoline, the anilide of acetoacetic acid, the ortho-ani'sidide or the para-nitranilide of acetoacetic acid, the 2:4-dichloroanilide of acetoaceticacid, etc. The azo-d'yestufis resulting from these components under the conditions indicated are thus esterified with the esterifying agents of U. S. Patents Nos. 2,170,262, 2,120,741, 2,199,048 and 2,276,187 such as, for example benzoylchloin which the symbol y-O- is in ortho-position to the azo group, and the symbol z in an adjacent position to the azo group,-

R1N=N-R2- stands for the radical of an azo compound in which R1 represents an aromatic radical selected from the group of aromatic radicals of the benzene and of the naphthalene series, and R2 stands for the radical of a coupling component, at least one of theradicals R1 and R2 containing at least one nitro group, y standing for an acyl radical containing at least one saltforming group selected from the group consisting of the radical of a quaternary ammonium group and of a sulfonic group, and z for a member of the group consisting of hydrogen and an acyl radical containing at least one salt-forming group selected from the group consisting of the radical of a quaternary ammonium group and of a sulfonic group.

The esterification products may be worked up in such a manner that after the reaction is completed, the tertiary base is distilled off under reduced pressure and the residue is transferred into a salt solution, whereby the esterification products are separated.

The latter may also be obtained in the form of more difiicultly soluble double salts, for instance zinc double salts, if a suitable metal chloride, such as, for instance, zinc chloride or inorganic or organic acids are added, to the original reaction mixture.

The following examples illustrate the invention, but are not to be regarded as limiting it in any way, the parts being by weight:

EXAMPLE 1 3.1 parts of the dyestulf obtained from diazotized 1-hydroxy-2-amino-5-nitrobenzene and Z-hydroxynaphthalene are introduced at a temperature of 40-45" C. into a solution of parts of pyridine and 5;! parts of benzoic acid-3-sulfochloride and stirred for one hour at this temperature. The pyridine is then distilled off under reduced pressure and the residue is introduced into 100 parts of a sodium chloride solution of 20 per cent strength and stirred, whereafter the dyestufi is filtered all and dried in a vacuum at 30-40 C.

The new dyestufi which probably corresponds in the free form tothe formula SOsH -@G O 04a A similar dyestufi is obtained by replacing the above 5.7 parts of benzoic acid-3-sulfochloride by 8.2 parts of benzoic acid-3:5-disu1fochloride, this dyestuff corresponding in the free form very probably to the formula EON -G b a When using, instead of the above mentioned 8.2 parts, 4.1 parts of benzoic acid-3:5-disulfochloride, there is obtained a dyestuff which very probably corresponds in the free form to the formula EXAMPLE 2 SOBH A similar dyestuff is also obtained by replacing the 5.7 parts of benzoylchloride-3-sulfonic acid by 8.2 parts of benzoic acid-3:5-disulfochloride. Such a dyestufi corresponds very probabl to the formula SO H' SOaH benzene andiZ-lwdroxynaphthalene are esterified xnew .dyestufi which in the free form probably and worked up as indicated-in Example 1 with It is often also advantageous to use 4-21110!- ;3.4 ,parts of the .dyestufi 'obtained "from 'dimethylbenmylcmmde as q agent and azotized '1 hydroxye2-amino4-chloro -5 -*nitrothe dyestufi obable formula and worked up as "indicated in Example 1 with 5.7 parts of benzoic zaeid=3=sulfochloride "The norrespondstothe formula SOB'H '0 5810211 dissolves in distilled water to give a red-' coloration and dyes wool in the presenceof chromium salts l I ha blue tint with v ood ro ertie of 3 H g 5 g p p s is then obtamed byaesteritylng the dyestufi from diazotized .1 -,-hydroxy-Z-amino-4-chlorobenzene and .1 -l(3'-nitropheny1)-3-methyl-5+pyrazolone in pyridine.

The following table gives further examples of dyestuffs obtainable in accordance iwiththe present invention:

3.4 parts of the dyestuff obtained :from 'diazotized 1-hydroxy- 2-amino-4-chloro 6 --nitrobenzene and 'z-hydroxynaphthalene are esterfled Table 'd'yestufi from Dyeing of the V Acylating agent chromium comdiazoeomponent coupling component F W00] (1) l-hydroxyr2-ainino-5-nitrobenzene. 1-hydroxy-5.S-liiChIoro-naphthalena. benzoicacid-3-sulfoch1oride,.,. i "gray-blue. (2%J1-hydroxy 2rammo-4echloifo fi-nitrosame same blue.

enzene (3) same l-hydroxyi-methylb e same 1 t. town. -(4) l-hydroxyeil-amino-:6-dinitrobensame same bro ism? zene (5)1-hydIoxy-21amino:5nitrobenzene laphenyhaemethyl-5-pyrazolone benzo'icacid3:5-disu1fochloride. red. (6) 1-hydroxy-2-amino-4-nitrobenzene. same .2 same orange. (7) same 2:4-dihydro'xyquinoline .e d,

(8) same acetoaceticacid-ortho-anisidide (9) Lhydrogy-Z-amino-i-ehlorobenzene 1-mta-nitrophenyl-3-methyl -5-pyra- Y (zo one yellow-orange. red

5.7 parts of :benzoic acid-3- sulfochloride. The The dyestufis of this table p-robably;correspond new dyestufi which in the :free form probably '45 in their free form to thejfollowing formulas: corresponds to 'the' iormula OQN- t. .1 555 dissolves in distilled water with an orange colora- (2) 80m tion and dyes woolin the-presence of chromium sum salts reddish .blue ,tints .of very .good properties of fastness. A similar product is obtained withbenzoic acid-3:5-disulfochloride as acylating agent. F

The dyestufi obtained from diarontized 1-hydroxy -l2 amino-a-nitronaphthalene and 2-.hy- =droxynaphtha1ene can alsobeesterified with henzoic acidsulfochloride. This dyestuff dyes wool in the presence of chromium-salts very fast black :shades.

,Such dyestuffs may-be obtained alternatively by (3) so n subjecting, for example,the dyestuff obtained by :coupling the diazo compound of l-hydroxy-2- .amino-si-ohlorobenzene with Z-hydroirynaPhtha- 7 .lene, to nitration, it being assumed thatthe'nitro vgroup enters into the nucleus of the hydroxynaphthalene. This dyestufi is then also converted into the ester by treating with l-benzoic acid sulfochloride.

OCH:

100 parts of well wetted wool are introduced at 60 C. in a dyebath containing in 4000 parts of water 4 parts of the dyestufi obtainable according to the first paragraph of Example 1, 3 parts of ammonium sulfate, 3 parts of sodium chromate and parts of Glauber salt. In the course of minutes, the temperature is raised to the boil and ,the'wool is "dyedat the boil for hour. After the addition of 0.5-1 per cent. of acetic acid of 40 percent. strength dyeing is continued for another hour at the boil. The wool is then rinsed and dried. It is dyed a fast black tint.

EXAMPLE 6 100 parts of well wetted wool are introduced at CE- into a dyebath containing in 4000 parts of water lpart of the dyestuff obtainable according to Example 3, 4 parts of acetic acid and 10 parts of Glauber salt. In the course of 30 minutes, the temperature is raised to the boiling point and the wool is dyed at the boil for hour. After the addition of 1 part of sulfuric acid of 66 B. dyeing is continuedfor another 15 minutes at the boil, the dyebath is then cooled to about 70 C., 1 part of potassium bichromate is added, the temperature is raised to the boiling point and chroming is carried out for about 40v minutes at the boil. The wool is then rinsed and. dried. It is dyed a fast navy blue tint.

What we claim is: F

1. The ester-like azo dyestufi derivatives of the formula SOaH in which-the SOgH' radical is in ortho-position to the azo group and the radical -Oz is in a position adjacent the azo group, one. of the symbols R1 and R2 represents a benzene radical containing 5], nitro group,

the other one of the symbols R1 and R2 represents a naphthalene radical, R1 and R2 being free from water-solubility-imparting substituents, and

.2 stands for a member selected from the group consisting of hydrogen and the radical s oan 2. The ester-like azo-dyestufi derivatives corresponding in their free form to the general formula wherein one a: stands for hydrogen and the other xfor anitro group.

FRIEDRICH FELIX. ALPHONSE HECKENDORN. ERNST REICH.

FRITZ OESTERLEIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Linch Oct. 10, 1944 Certificate of Correction Patent N 0. 2,495,243 January 24, 1950 FRIEDRICH FELIX ET AL.

It is hereby certified that errors appear in the printed specification of the above numbered patent requiring correction as follows:

Column 5, line 26, for esterfied read estemjfied; lines 48 and 49, for that portion of the formula reading 0 o t o read 15-0 column 5, line 61, for diazontized read diazotized;

and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 6th day of June, A. D. 1950.

[SEAL] THOMAS F. MURPHY,

Assistant Oommz'ssz'mzer of Patents. 

1. THE ESTER-LIKE AZO DYESTUFF DERIVATIVES OF THE FORMULA 